import sys

x, y, h = map(int, input().split())

x *= 1000
y *= 1000


def solve(x, y, h):
    mx = 0
    x_1 = x
    y_1 = y
    h_1 = h
    x_count = 0
    while h_1 < x_1:
        y_1 *= 2
        h_1 *= 4
        x_count += 1

        x_2 = x_1
        y_2 = y_1
        h_2 = h_1
        count = x_count
        while h_2 < y_2:
            h_2 *= 4
            x_2 *= 2
            count += 1

        if mx < count:
            mx = count

    return mx


print(max(solve(x, y, h), solve(y, x, h)))